package com.itheima.servlet;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

public class BaseServlet extends HttpServlet {

    @Override
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        // 利用反射调用方法 -> 得到方法名
        String requestURI = req.getRequestURI();
        String methodName = requestURI.substring(requestURI.lastIndexOf("/") + 1);
        System.out.println(methodName);
        // 反射
        Method declaredMethod = null;
        try {
            declaredMethod = this.getClass().getDeclaredMethod(methodName,HttpServletRequest.class,HttpServletResponse.class);
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
        }
        declaredMethod.setAccessible(true);// 确保可以执行
        try {
            declaredMethod.invoke(this,req,resp);
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (InvocationTargetException e) {
            e.printStackTrace();
        }

    }
}
